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Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[mirror_ubuntu-jammy-kernel.git] / drivers / net / ethernet / seeq / sgiseeq.c
1 /*
2 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
5 */
6
7 #undef DEBUG
8
9 #include <linux/dma-mapping.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/interrupt.h>
16 #include <linux/string.h>
17 #include <linux/delay.h>
18 #include <linux/netdevice.h>
19 #include <linux/platform_device.h>
20 #include <linux/etherdevice.h>
21 #include <linux/skbuff.h>
22
23 #include <asm/sgi/hpc3.h>
24 #include <asm/sgi/ip22.h>
25 #include <asm/sgi/seeq.h>
26
27 #include "sgiseeq.h"
28
29 static char *sgiseeqstr = "SGI Seeq8003";
30
31 /*
32 * If you want speed, you do something silly, it always has worked for me. So,
33 * with that in mind, I've decided to make this driver look completely like a
34 * stupid Lance from a driver architecture perspective. Only difference is that
35 * here our "ring buffer" looks and acts like a real Lance one does but is
36 * laid out like how the HPC DMA and the Seeq want it to. You'd be surprised
37 * how a stupid idea like this can pay off in performance, not to mention
38 * making this driver 2,000 times easier to write. ;-)
39 */
40
41 /* Tune these if we tend to run out often etc. */
42 #define SEEQ_RX_BUFFERS 16
43 #define SEEQ_TX_BUFFERS 16
44
45 #define PKT_BUF_SZ 1584
46
47 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
48 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
49 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
50 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
51
52 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
53 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
54 sp->tx_old - sp->tx_new - 1)
55
56 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
57 (dma_addr_t)((unsigned long)(v) - \
58 (unsigned long)((sp)->rx_desc)))
59
60 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
61 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
62 */
63 static int rx_copybreak = 100;
64
65 #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
66
67 struct sgiseeq_rx_desc {
68 volatile struct hpc_dma_desc rdma;
69 u8 padding[PAD_SIZE];
70 struct sk_buff *skb;
71 };
72
73 struct sgiseeq_tx_desc {
74 volatile struct hpc_dma_desc tdma;
75 u8 padding[PAD_SIZE];
76 struct sk_buff *skb;
77 };
78
79 /*
80 * Warning: This structure is laid out in a certain way because HPC dma
81 * descriptors must be 8-byte aligned. So don't touch this without
82 * some care.
83 */
84 struct sgiseeq_init_block { /* Note the name ;-) */
85 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
86 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
87 };
88
89 struct sgiseeq_private {
90 struct sgiseeq_init_block *srings;
91 dma_addr_t srings_dma;
92
93 /* Ptrs to the descriptors in uncached space. */
94 struct sgiseeq_rx_desc *rx_desc;
95 struct sgiseeq_tx_desc *tx_desc;
96
97 char *name;
98 struct hpc3_ethregs *hregs;
99 struct sgiseeq_regs *sregs;
100
101 /* Ring entry counters. */
102 unsigned int rx_new, tx_new;
103 unsigned int rx_old, tx_old;
104
105 int is_edlc;
106 unsigned char control;
107 unsigned char mode;
108
109 spinlock_t tx_lock;
110 };
111
112 static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
113 {
114 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
115 DMA_FROM_DEVICE);
116 }
117
118 static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
119 {
120 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
121 DMA_TO_DEVICE);
122 }
123
124 static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
125 {
126 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
127 udelay(20);
128 hregs->reset = 0;
129 }
130
131 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
132 struct sgiseeq_regs *sregs)
133 {
134 hregs->rx_ctrl = hregs->tx_ctrl = 0;
135 hpc3_eth_reset(hregs);
136 }
137
138 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
139 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
140
141 static inline void seeq_go(struct sgiseeq_private *sp,
142 struct hpc3_ethregs *hregs,
143 struct sgiseeq_regs *sregs)
144 {
145 sregs->rstat = sp->mode | RSTAT_GO_BITS;
146 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
147 }
148
149 static inline void __sgiseeq_set_mac_address(struct net_device *dev)
150 {
151 struct sgiseeq_private *sp = netdev_priv(dev);
152 struct sgiseeq_regs *sregs = sp->sregs;
153 int i;
154
155 sregs->tstat = SEEQ_TCMD_RB0;
156 for (i = 0; i < 6; i++)
157 sregs->rw.eth_addr[i] = dev->dev_addr[i];
158 }
159
160 static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
161 {
162 struct sgiseeq_private *sp = netdev_priv(dev);
163 struct sockaddr *sa = addr;
164
165 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
166
167 spin_lock_irq(&sp->tx_lock);
168 __sgiseeq_set_mac_address(dev);
169 spin_unlock_irq(&sp->tx_lock);
170
171 return 0;
172 }
173
174 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
175 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
176 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
177
178 static int seeq_init_ring(struct net_device *dev)
179 {
180 struct sgiseeq_private *sp = netdev_priv(dev);
181 int i;
182
183 netif_stop_queue(dev);
184 sp->rx_new = sp->tx_new = 0;
185 sp->rx_old = sp->tx_old = 0;
186
187 __sgiseeq_set_mac_address(dev);
188
189 /* Setup tx ring. */
190 for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
191 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
192 dma_sync_desc_dev(dev, &sp->tx_desc[i]);
193 }
194
195 /* And now the rx ring. */
196 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
197 if (!sp->rx_desc[i].skb) {
198 dma_addr_t dma_addr;
199 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
200
201 if (skb == NULL)
202 return -ENOMEM;
203 skb_reserve(skb, 2);
204 dma_addr = dma_map_single(dev->dev.parent,
205 skb->data - 2,
206 PKT_BUF_SZ, DMA_FROM_DEVICE);
207 sp->rx_desc[i].skb = skb;
208 sp->rx_desc[i].rdma.pbuf = dma_addr;
209 }
210 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
211 dma_sync_desc_dev(dev, &sp->rx_desc[i]);
212 }
213 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
214 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
215 return 0;
216 }
217
218 static void seeq_purge_ring(struct net_device *dev)
219 {
220 struct sgiseeq_private *sp = netdev_priv(dev);
221 int i;
222
223 /* clear tx ring. */
224 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
225 if (sp->tx_desc[i].skb) {
226 dev_kfree_skb(sp->tx_desc[i].skb);
227 sp->tx_desc[i].skb = NULL;
228 }
229 }
230
231 /* And now the rx ring. */
232 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
233 if (sp->rx_desc[i].skb) {
234 dev_kfree_skb(sp->rx_desc[i].skb);
235 sp->rx_desc[i].skb = NULL;
236 }
237 }
238 }
239
240 #ifdef DEBUG
241 static struct sgiseeq_private *gpriv;
242 static struct net_device *gdev;
243
244 static void sgiseeq_dump_rings(void)
245 {
246 static int once;
247 struct sgiseeq_rx_desc *r = gpriv->rx_desc;
248 struct sgiseeq_tx_desc *t = gpriv->tx_desc;
249 struct hpc3_ethregs *hregs = gpriv->hregs;
250 int i;
251
252 if (once)
253 return;
254 once++;
255 printk("RING DUMP:\n");
256 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
257 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
258 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
259 r[i].rdma.pnext);
260 i += 1;
261 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
262 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
263 r[i].rdma.pnext);
264 }
265 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
266 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
267 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
268 t[i].tdma.pnext);
269 i += 1;
270 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
271 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
272 t[i].tdma.pnext);
273 }
274 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
275 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
276 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
277 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
278 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
279 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
280 }
281 #endif
282
283 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
284 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
285
286 static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
287 struct sgiseeq_regs *sregs)
288 {
289 struct hpc3_ethregs *hregs = sp->hregs;
290 int err;
291
292 reset_hpc3_and_seeq(hregs, sregs);
293 err = seeq_init_ring(dev);
294 if (err)
295 return err;
296
297 /* Setup to field the proper interrupt types. */
298 if (sp->is_edlc) {
299 sregs->tstat = TSTAT_INIT_EDLC;
300 sregs->rw.wregs.control = sp->control;
301 sregs->rw.wregs.frame_gap = 0;
302 } else {
303 sregs->tstat = TSTAT_INIT_SEEQ;
304 }
305
306 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
307 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
308
309 seeq_go(sp, hregs, sregs);
310 return 0;
311 }
312
313 static void record_rx_errors(struct net_device *dev, unsigned char status)
314 {
315 if (status & SEEQ_RSTAT_OVERF ||
316 status & SEEQ_RSTAT_SFRAME)
317 dev->stats.rx_over_errors++;
318 if (status & SEEQ_RSTAT_CERROR)
319 dev->stats.rx_crc_errors++;
320 if (status & SEEQ_RSTAT_DERROR)
321 dev->stats.rx_frame_errors++;
322 if (status & SEEQ_RSTAT_REOF)
323 dev->stats.rx_errors++;
324 }
325
326 static inline void rx_maybe_restart(struct sgiseeq_private *sp,
327 struct hpc3_ethregs *hregs,
328 struct sgiseeq_regs *sregs)
329 {
330 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
331 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
332 seeq_go(sp, hregs, sregs);
333 }
334 }
335
336 static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
337 struct hpc3_ethregs *hregs,
338 struct sgiseeq_regs *sregs)
339 {
340 struct sgiseeq_rx_desc *rd;
341 struct sk_buff *skb = NULL;
342 struct sk_buff *newskb;
343 unsigned char pkt_status;
344 int len = 0;
345 unsigned int orig_end = PREV_RX(sp->rx_new);
346
347 /* Service every received packet. */
348 rd = &sp->rx_desc[sp->rx_new];
349 dma_sync_desc_cpu(dev, rd);
350 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
351 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
352 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
353 PKT_BUF_SZ, DMA_FROM_DEVICE);
354 pkt_status = rd->skb->data[len];
355 if (pkt_status & SEEQ_RSTAT_FIG) {
356 /* Packet is OK. */
357 /* We don't want to receive our own packets */
358 if (!ether_addr_equal(rd->skb->data + 6, dev->dev_addr)) {
359 if (len > rx_copybreak) {
360 skb = rd->skb;
361 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
362 if (!newskb) {
363 newskb = skb;
364 skb = NULL;
365 goto memory_squeeze;
366 }
367 skb_reserve(newskb, 2);
368 } else {
369 skb = netdev_alloc_skb_ip_align(dev, len);
370 if (skb)
371 skb_copy_to_linear_data(skb, rd->skb->data, len);
372
373 newskb = rd->skb;
374 }
375 memory_squeeze:
376 if (skb) {
377 skb_put(skb, len);
378 skb->protocol = eth_type_trans(skb, dev);
379 netif_rx(skb);
380 dev->stats.rx_packets++;
381 dev->stats.rx_bytes += len;
382 } else {
383 dev->stats.rx_dropped++;
384 }
385 } else {
386 /* Silently drop my own packets */
387 newskb = rd->skb;
388 }
389 } else {
390 record_rx_errors(dev, pkt_status);
391 newskb = rd->skb;
392 }
393 rd->skb = newskb;
394 rd->rdma.pbuf = dma_map_single(dev->dev.parent,
395 newskb->data - 2,
396 PKT_BUF_SZ, DMA_FROM_DEVICE);
397
398 /* Return the entry to the ring pool. */
399 rd->rdma.cntinfo = RCNTINFO_INIT;
400 sp->rx_new = NEXT_RX(sp->rx_new);
401 dma_sync_desc_dev(dev, rd);
402 rd = &sp->rx_desc[sp->rx_new];
403 dma_sync_desc_cpu(dev, rd);
404 }
405 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
406 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
407 dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]);
408 dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
409 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
410 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
411 rx_maybe_restart(sp, hregs, sregs);
412 }
413
414 static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
415 struct sgiseeq_regs *sregs)
416 {
417 if (sp->is_edlc) {
418 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
419 sregs->rw.wregs.control = sp->control;
420 }
421 }
422
423 static inline void kick_tx(struct net_device *dev,
424 struct sgiseeq_private *sp,
425 struct hpc3_ethregs *hregs)
426 {
427 struct sgiseeq_tx_desc *td;
428 int i = sp->tx_old;
429
430 /* If the HPC aint doin nothin, and there are more packets
431 * with ETXD cleared and XIU set we must make very certain
432 * that we restart the HPC else we risk locking up the
433 * adapter. The following code is only safe iff the HPCDMA
434 * is not active!
435 */
436 td = &sp->tx_desc[i];
437 dma_sync_desc_cpu(dev, td);
438 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
439 (HPCDMA_XIU | HPCDMA_ETXD)) {
440 i = NEXT_TX(i);
441 td = &sp->tx_desc[i];
442 dma_sync_desc_cpu(dev, td);
443 }
444 if (td->tdma.cntinfo & HPCDMA_XIU) {
445 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
446 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
447 }
448 }
449
450 static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
451 struct hpc3_ethregs *hregs,
452 struct sgiseeq_regs *sregs)
453 {
454 struct sgiseeq_tx_desc *td;
455 unsigned long status = hregs->tx_ctrl;
456 int j;
457
458 tx_maybe_reset_collisions(sp, sregs);
459
460 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
461 /* Oops, HPC detected some sort of error. */
462 if (status & SEEQ_TSTAT_R16)
463 dev->stats.tx_aborted_errors++;
464 if (status & SEEQ_TSTAT_UFLOW)
465 dev->stats.tx_fifo_errors++;
466 if (status & SEEQ_TSTAT_LCLS)
467 dev->stats.collisions++;
468 }
469
470 /* Ack 'em... */
471 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
472 td = &sp->tx_desc[j];
473
474 dma_sync_desc_cpu(dev, td);
475 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
476 break;
477 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
478 if (!(status & HPC3_ETXCTRL_ACTIVE)) {
479 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
480 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
481 }
482 break;
483 }
484 dev->stats.tx_packets++;
485 sp->tx_old = NEXT_TX(sp->tx_old);
486 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
487 td->tdma.cntinfo |= HPCDMA_EOX;
488 if (td->skb) {
489 dev_kfree_skb_any(td->skb);
490 td->skb = NULL;
491 }
492 dma_sync_desc_dev(dev, td);
493 }
494 }
495
496 static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
497 {
498 struct net_device *dev = (struct net_device *) dev_id;
499 struct sgiseeq_private *sp = netdev_priv(dev);
500 struct hpc3_ethregs *hregs = sp->hregs;
501 struct sgiseeq_regs *sregs = sp->sregs;
502
503 spin_lock(&sp->tx_lock);
504
505 /* Ack the IRQ and set software state. */
506 hregs->reset = HPC3_ERST_CLRIRQ;
507
508 /* Always check for received packets. */
509 sgiseeq_rx(dev, sp, hregs, sregs);
510
511 /* Only check for tx acks if we have something queued. */
512 if (sp->tx_old != sp->tx_new)
513 sgiseeq_tx(dev, sp, hregs, sregs);
514
515 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
516 netif_wake_queue(dev);
517 }
518 spin_unlock(&sp->tx_lock);
519
520 return IRQ_HANDLED;
521 }
522
523 static int sgiseeq_open(struct net_device *dev)
524 {
525 struct sgiseeq_private *sp = netdev_priv(dev);
526 struct sgiseeq_regs *sregs = sp->sregs;
527 unsigned int irq = dev->irq;
528 int err;
529
530 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
531 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
532 return -EAGAIN;
533 }
534
535 err = init_seeq(dev, sp, sregs);
536 if (err)
537 goto out_free_irq;
538
539 netif_start_queue(dev);
540
541 return 0;
542
543 out_free_irq:
544 free_irq(irq, dev);
545
546 return err;
547 }
548
549 static int sgiseeq_close(struct net_device *dev)
550 {
551 struct sgiseeq_private *sp = netdev_priv(dev);
552 struct sgiseeq_regs *sregs = sp->sregs;
553 unsigned int irq = dev->irq;
554
555 netif_stop_queue(dev);
556
557 /* Shutdown the Seeq. */
558 reset_hpc3_and_seeq(sp->hregs, sregs);
559 free_irq(irq, dev);
560 seeq_purge_ring(dev);
561
562 return 0;
563 }
564
565 static inline int sgiseeq_reset(struct net_device *dev)
566 {
567 struct sgiseeq_private *sp = netdev_priv(dev);
568 struct sgiseeq_regs *sregs = sp->sregs;
569 int err;
570
571 err = init_seeq(dev, sp, sregs);
572 if (err)
573 return err;
574
575 netif_trans_update(dev); /* prevent tx timeout */
576 netif_wake_queue(dev);
577
578 return 0;
579 }
580
581 static netdev_tx_t
582 sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
583 {
584 struct sgiseeq_private *sp = netdev_priv(dev);
585 struct hpc3_ethregs *hregs = sp->hregs;
586 unsigned long flags;
587 struct sgiseeq_tx_desc *td;
588 int len, entry;
589
590 spin_lock_irqsave(&sp->tx_lock, flags);
591
592 /* Setup... */
593 len = skb->len;
594 if (len < ETH_ZLEN) {
595 if (skb_padto(skb, ETH_ZLEN)) {
596 spin_unlock_irqrestore(&sp->tx_lock, flags);
597 return NETDEV_TX_OK;
598 }
599 len = ETH_ZLEN;
600 }
601
602 dev->stats.tx_bytes += len;
603 entry = sp->tx_new;
604 td = &sp->tx_desc[entry];
605 dma_sync_desc_cpu(dev, td);
606
607 /* Create entry. There are so many races with adding a new
608 * descriptor to the chain:
609 * 1) Assume that the HPC is off processing a DMA chain while
610 * we are changing all of the following.
611 * 2) Do no allow the HPC to look at a new descriptor until
612 * we have completely set up it's state. This means, do
613 * not clear HPCDMA_EOX in the current last descritptor
614 * until the one we are adding looks consistent and could
615 * be processes right now.
616 * 3) The tx interrupt code must notice when we've added a new
617 * entry and the HPC got to the end of the chain before we
618 * added this new entry and restarted it.
619 */
620 td->skb = skb;
621 td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
622 len, DMA_TO_DEVICE);
623 td->tdma.cntinfo = (len & HPCDMA_BCNT) |
624 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
625 dma_sync_desc_dev(dev, td);
626 if (sp->tx_old != sp->tx_new) {
627 struct sgiseeq_tx_desc *backend;
628
629 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
630 dma_sync_desc_cpu(dev, backend);
631 backend->tdma.cntinfo &= ~HPCDMA_EOX;
632 dma_sync_desc_dev(dev, backend);
633 }
634 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
635
636 /* Maybe kick the HPC back into motion. */
637 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
638 kick_tx(dev, sp, hregs);
639
640 if (!TX_BUFFS_AVAIL(sp))
641 netif_stop_queue(dev);
642 spin_unlock_irqrestore(&sp->tx_lock, flags);
643
644 return NETDEV_TX_OK;
645 }
646
647 static void timeout(struct net_device *dev)
648 {
649 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
650 sgiseeq_reset(dev);
651
652 netif_trans_update(dev); /* prevent tx timeout */
653 netif_wake_queue(dev);
654 }
655
656 static void sgiseeq_set_multicast(struct net_device *dev)
657 {
658 struct sgiseeq_private *sp = netdev_priv(dev);
659 unsigned char oldmode = sp->mode;
660
661 if(dev->flags & IFF_PROMISC)
662 sp->mode = SEEQ_RCMD_RANY;
663 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
664 sp->mode = SEEQ_RCMD_RBMCAST;
665 else
666 sp->mode = SEEQ_RCMD_RBCAST;
667
668 /* XXX I know this sucks, but is there a better way to reprogram
669 * XXX the receiver? At least, this shouldn't happen too often.
670 */
671
672 if (oldmode != sp->mode)
673 sgiseeq_reset(dev);
674 }
675
676 static inline void setup_tx_ring(struct net_device *dev,
677 struct sgiseeq_tx_desc *buf,
678 int nbufs)
679 {
680 struct sgiseeq_private *sp = netdev_priv(dev);
681 int i = 0;
682
683 while (i < (nbufs - 1)) {
684 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
685 buf[i].tdma.pbuf = 0;
686 dma_sync_desc_dev(dev, &buf[i]);
687 i++;
688 }
689 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
690 dma_sync_desc_dev(dev, &buf[i]);
691 }
692
693 static inline void setup_rx_ring(struct net_device *dev,
694 struct sgiseeq_rx_desc *buf,
695 int nbufs)
696 {
697 struct sgiseeq_private *sp = netdev_priv(dev);
698 int i = 0;
699
700 while (i < (nbufs - 1)) {
701 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
702 buf[i].rdma.pbuf = 0;
703 dma_sync_desc_dev(dev, &buf[i]);
704 i++;
705 }
706 buf[i].rdma.pbuf = 0;
707 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
708 dma_sync_desc_dev(dev, &buf[i]);
709 }
710
711 static const struct net_device_ops sgiseeq_netdev_ops = {
712 .ndo_open = sgiseeq_open,
713 .ndo_stop = sgiseeq_close,
714 .ndo_start_xmit = sgiseeq_start_xmit,
715 .ndo_tx_timeout = timeout,
716 .ndo_set_rx_mode = sgiseeq_set_multicast,
717 .ndo_set_mac_address = sgiseeq_set_mac_address,
718 .ndo_validate_addr = eth_validate_addr,
719 };
720
721 static int sgiseeq_probe(struct platform_device *pdev)
722 {
723 struct sgiseeq_platform_data *pd = dev_get_platdata(&pdev->dev);
724 struct hpc3_regs *hpcregs = pd->hpc;
725 struct sgiseeq_init_block *sr;
726 unsigned int irq = pd->irq;
727 struct sgiseeq_private *sp;
728 struct net_device *dev;
729 int err;
730
731 dev = alloc_etherdev(sizeof (struct sgiseeq_private));
732 if (!dev) {
733 err = -ENOMEM;
734 goto err_out;
735 }
736
737 platform_set_drvdata(pdev, dev);
738 SET_NETDEV_DEV(dev, &pdev->dev);
739 sp = netdev_priv(dev);
740
741 /* Make private data page aligned */
742 sr = dma_alloc_attrs(&pdev->dev, sizeof(*sp->srings), &sp->srings_dma,
743 GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
744 if (!sr) {
745 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
746 err = -ENOMEM;
747 goto err_out_free_dev;
748 }
749 sp->srings = sr;
750 sp->rx_desc = sp->srings->rxvector;
751 sp->tx_desc = sp->srings->txvector;
752 spin_lock_init(&sp->tx_lock);
753
754 /* A couple calculations now, saves many cycles later. */
755 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
756 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
757
758 memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
759
760 #ifdef DEBUG
761 gpriv = sp;
762 gdev = dev;
763 #endif
764 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
765 sp->hregs = &hpcregs->ethregs;
766 sp->name = sgiseeqstr;
767 sp->mode = SEEQ_RCMD_RBCAST;
768
769 /* Setup PIO and DMA transfer timing */
770 sp->hregs->pconfig = 0x161;
771 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
772 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
773
774 /* Setup PIO and DMA transfer timing */
775 sp->hregs->pconfig = 0x161;
776 sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP |
777 HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026;
778
779 /* Reset the chip. */
780 hpc3_eth_reset(sp->hregs);
781
782 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
783 if (sp->is_edlc)
784 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
785 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
786 SEEQ_CTRL_ENCARR;
787
788 dev->netdev_ops = &sgiseeq_netdev_ops;
789 dev->watchdog_timeo = (200 * HZ) / 1000;
790 dev->irq = irq;
791
792 if (register_netdev(dev)) {
793 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
794 "aborting.\n");
795 err = -ENODEV;
796 goto err_out_free_page;
797 }
798
799 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
800
801 return 0;
802
803 err_out_free_page:
804 free_page((unsigned long) sp->srings);
805 err_out_free_dev:
806 free_netdev(dev);
807
808 err_out:
809 return err;
810 }
811
812 static int sgiseeq_remove(struct platform_device *pdev)
813 {
814 struct net_device *dev = platform_get_drvdata(pdev);
815 struct sgiseeq_private *sp = netdev_priv(dev);
816
817 unregister_netdev(dev);
818 dma_free_attrs(&pdev->dev, sizeof(*sp->srings), sp->srings,
819 sp->srings_dma, DMA_ATTR_NON_CONSISTENT);
820 free_netdev(dev);
821
822 return 0;
823 }
824
825 static struct platform_driver sgiseeq_driver = {
826 .probe = sgiseeq_probe,
827 .remove = sgiseeq_remove,
828 .driver = {
829 .name = "sgiseeq",
830 }
831 };
832
833 module_platform_driver(sgiseeq_driver);
834
835 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
836 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
837 MODULE_LICENSE("GPL");
838 MODULE_ALIAS("platform:sgiseeq");
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